Suppose that I have 4 groups means:18,13,16,10, and 4 standard deviation:10,9,9,8, and α=0.05,β=0.1, how many samples do I need?

I'm trying to calculate the sample size using pwr package in R. But I don't know how to calculate the f in pwr.anova.test().

Also, if I use power.anova.test, I don't know how to calculate the within.var.

Anyone can help? Thank you very much!



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